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Namely, he is guessing which pool will be the first to limit its own staking 'power' (share of controlled validators participating in signing Ethereum (ETH) transactions) by e.g. 22 per cent of total validators number.
It looks reasonable for him to increase fees for the participans of staking pools controlling over 15 % of network.
It should be noticed that Ethereum (ETH) - even in its Proof-of-Work (PoW) version is criticised for 'centralization': major mining pools are controlling large lions share of its hashrate.
Step by step, Input Output Global (IOG) introduced a number of limitations to make staking through large pools less profitable.
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